18812837 has 2 divisors, whose sum is σ = 18812838. Its totient is φ = 18812836.

The previous prime is 18812821. The next prime is 18812867. The reversal of 18812837 is 73821881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 417316 = 4289^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 18812837 - 2⁴ = 18812821 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18812837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18812867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406418 + 9406419.

It is an arithmetic number, because the mean of its divisors is an integer number (9406419).

Almost surely, 2^18812837 is an apocalyptic number.

It is an amenable number.

18812837 is a deficient number, since it is larger than the sum of its proper divisors (1).

18812837 is an equidigital number, since it uses as much as digits as its factorization.

18812837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 18812837 is about 4337.3767417645. The cubic root of 18812837 is about 265.9610859463.

The spelling of 18812837 in words is "eighteen million, eight hundred twelve thousand, eight hundred thirty-seven".